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CO2 Conversion in a Microwave Plasma Catalyst System

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CO2 Conversion in a Microwave Plasma Catalyst System ( co2-conversion-a-microwave-plasma-catalyst-system )

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(a) (b) Figure 6.31: Computational efficiency results including surface reactions: a) energy efficiency, b) conversion efficiency. The plasma properties simulated in GlobalKin have indicated that the discharge acts as purely non-thermal. This contradicts the experimental results which indicate a high gas temperature in thermal equilibrium with the vibrational temperature, where Tg ≈ 1/2Te. According to the simulation, Tg < 1/10Te. In support of the experimental gas temperature, a published report of an atmospheric pressure surface wave discharge has also documented high gas temperatures when operating with molecular species. In this study, a 1 kW microwave-sustained N2 discharge has a rotational temperature of around 5000 K (assumed equivalent to gas temperature), determined from the N+2 rotational spectrum [55]. Thus the experimentally measured gas temperature provides a better estimate than the simulation results. The simulated electron densities, though, can actually support the experimental results. The electron density computed by GlobalKin for the CO2 plasma is about 3-4 orders of magnitude lower than expected, based on experimental results reported for the non-thermal atmospheric pressure surface wave discharges shown in Figure 5.3. For the CO2 plasma the ionization degree becomes only about 10−9 − 10−8, which is lower 145

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